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Related Experiment Videos

Urban ozone measurements using differential optical absorption spectroscopy.

J A Morales1, J Treacy, S Coffey

  • 1Facility for Optical Characterisation and Spectroscopy, Dublin Institute of Technology, Kevin Street, 8, Dublin, Ireland. alberto.morales@dit.ie

Analytical and Bioanalytical Chemistry
|February 14, 2004
PubMed
Summary

European air quality directives necessitate ozone monitoring. A Dublin study using differential optical absorption spectroscopy (DOAS) found that ground-level ozone is significantly influenced by long-range transport from continental Europe.

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Area of Science:

  • Environmental Science
  • Atmospheric Chemistry
  • Spectroscopy

Background:

  • European Commission directives mandate monitoring of gaseous pollutants like ozone to improve air quality.
  • Compliance with EU legislation, enhanced pollution warnings, and environmental planning necessitate accurate ozone monitoring.
  • Open-path spectroscopic techniques, such as differential optical absorption spectroscopy (DOAS), offer advantages over traditional methods for pollutant analysis.

Purpose of the Study:

  • To monitor urban background ozone concentrations in Dublin city centre using DOAS.
  • To compare DOAS measurements with a UV point-source analyser.
  • To assess the influence of trans-boundary pollution on ozone levels in Dublin within the context of EU directives.

Main Methods:

  • Installation and operation of a DOAS system in Dublin city centre.

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  • Measurement of urban background ozone concentrations.
  • Comparison of DOAS data with UV point-source analyser data.
  • Analysis of air mass origins and photochemical pollution events.

    • Main Results:

    • DOAS system successfully monitored ozone concentrations in Dublin.
    • Measurements were compared with a UV point-source analyser and evaluated against EU directives.
    • High ozone episodes correlated with the influx of photochemically polluted air masses from continental Europe.
    • Data suggest significant long-range transport influence on Dublin's ground ozone levels.

    Conclusions:

    • DOAS is a suitable technique for monitoring urban ozone levels and compliance with EU directives.
    • Long-range trans-boundary pollution significantly impacts ground-level ozone in Dublin.
    • Understanding pollution transport is crucial for effective air quality management in European cities.